2.8μm emission of Er-doped CaF2 planar waveguides fabricated by molecular beam epitaxy

Abstract

The wavelength range near 3μm has many applications in medical processes due to an overlap with the absorption spectrum of water. Emission of the Er3+ ion near 2.8μm, which operates on the transition from 4I11/2 to 4I13/2 is especially promising as it can be pumped by either 800nm GaAlAs or 980nm InGaAlAs diodes, paving the way for a compact device with low electrical energy consumption.